Asphalt road drainage system

Abstract

The utility model discloses an asphalt road drainage system which comprises a rainwater inspection well and a surface layer, an upper base layer, a lower base layer and a cushion layer which are sequentially arranged from top to bottom, and further comprises a water collecting pipe and a plurality of blind ditches, a plurality of water-permeable holes are formed in the pipe wall of the water-permeable pipe in a penetrating mode, the positions of the water-permeable holes are away from the bottom of the water-permeable pipe, one piece of inverted filter geotechnical cloth is laid on all the wall faces of the groove, the other piece of inverted filter geotechnical cloth wraps the outer side of the water-permeable pipe, and the groove is filled with the gravel filling layer which is located between the two pieces of inverted filter geotechnical cloth; the blind ditches are arranged in the transverse direction and the longitudinal direction of the road, the water permeable pipes in the blind ditches are communicated with one another, and the water collecting pipes are communicated with the water permeable pipes and the rainwater inspection wells. The road drainage device has a good drainage function, can effectively avoid the occurrence of road surface pump damage, enables a road to be kept in a good state, guarantees driving safety, and prolongs the service life of the road surface.

Description

TECHNICAL FIELD

[0001] The utility model relates to road engineering technical field, especially a kind of asphalt road drainage system. BACKGROUND

[0002] Pavement pumping disease is a common early water damage phenomenon of pavement, mainly occurs in asphalt pavement. So-called pavement pumping disease is that rainwater or groundwater seeps into base layer through crack, makes base layer soften, expand, and under the continuous action of vehicle load, washes out fine particles (such as powder in cement stabilized macadam) in base layer and makes it spout from surface layer joint or crack. With material loss, it can cause local segregation, loose and pothole of asphalt pavement, seriously affect the service performance and life of pavement.

[0003] For pavement pumping disease, there are mainly following processing methods at present:

[0004] I. Grouting reinforcement: mainly by drilling into cement slurry or other chemical slurry to disease site, fills crack and interstice, improves the stability of pavement. But this method can exist uneven slurry diffusion, setting time is difficult to control and so on, and for serious pumping disease effect is limited. Grouting reinforcement, excavation repair, surface seal treatment.

[0005] II. Excavation repair: completely excavate damaged structure layer, and newly lay base layer and surface layer. Although it can solve the problem, but construction cost is high, and period is long, and for rain season frequently or groundwater level is higher, it is difficult to guarantee that subsequent pavement pumping disease does not appear again.

[0006] III. Surface seal treatment: a layer of seal material is laid on pavement surface, to prevent water further intrusion into pavement structure. However, this method only protects from surface, and cannot solve the root problem of existing pumping disease.

[0007] It can be seen that, the processing method for pavement pumping disease at present focuses on aftertreatment, and it is difficult to completely solve the problem. UTILITY MODEL CONTENT

[0008] The utility model aims at providing a kind of asphalt road drainage system to radically cure pavement pumping disease.

[0009] In order to realize the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0010] The application relates to an asphalt road drainage system which comprises a rainwater inspection well and a surface layer, an upper base layer, a lower base layer and a cushion layer arranged in sequence from top to bottom, and further comprises a water collecting pipe and a plurality of blind drains, the blind drain comprises a groove, a water permeable pipe, a gravel filling layer and two layers of anti-filtration geotextile, the water permeable pipe is arranged in the groove, a plurality of water permeable holes are arranged through the wall of the water permeable pipe, the water permeable holes are arranged away from the bottom of the water permeable pipe, one layer of the anti-filtration geotextile is arranged on the wall surface of the groove, and the other layer of the anti-filtration geotextile is wrapped outside the water permeable pipe, and the gravel filling layer is filled in the groove and located between the two layers of anti-filtration geotextile; the blind drains are arranged along the transverse and longitudinal directions of the road, the water permeable pipes in the blind drains are communicated with each other, and the water collecting pipe is communicated with the water permeable pipes and the rainwater inspection well.

[0011] Further, the surface layer comprises an existing surface layer and a repaired surface layer, the repaired surface layer comprises a fine-grained asphalt concrete SMA-13 upper surface layer, a medium-grained modified asphalt concrete AC-16C middle surface layer and a coarse-grained asphalt concrete AC-25C lower surface layer arranged in sequence from top to bottom; the upper base layer comprises an existing upper base layer and a repaired upper base layer, the repaired upper base layer is a C25 concrete layer; the repaired surface layer and the repaired upper base layer are located directly above the blind drain and are provided with polypropylene anti-cracking geotextile and a transparent layer of asphalt between the repaired surface layer and the repaired upper base layer.

[0012] Further, the blind drain comprises transverse blind drains arranged along the transverse direction of the road and longitudinal blind drains arranged along the longitudinal direction of the road; the transverse blind drains are arranged at intervals, and the arrangement interval is 4-5 m; the longitudinal blind drain is located on the side of the transverse blind drain close to the road curb and is communicated with the transverse blind drains; the interval between the longitudinal blind drain and the road curb is 40-50 cm, and the water collecting pipe is connected between the longitudinal blind drain and the rainwater inspection well.

[0013] Further, the gravel filling layer is formed by filling gravel with a particle size of 5-8 cm, and the pore diameter of the water permeable hole is smaller than the particle size of the gravel.

[0014] Further, the water permeable pipe is a PVC pipe, and the slope of the water permeable pipe is greater than or equal to 1.0%.

[0015] Further, the water permeable holes are arranged on the top and side of the water permeable pipe, and the opening rate is 2.5-3.5%.

[0016] Further, the water permeable holes are arranged in a quincunx shape, the transverse spacing between the water permeable holes is 2.8-3.2 cm, the longitudinal spacing between the water permeable holes is 2.8-3.2 cm, and the diameter of the water permeable hole is 0.8-1.2 cm.

[0017] The application has the following beneficial effects:

[0018] The system can play a good drainage role from the root of causing the road pumping disease, can timely drain the road surface water and guarantee the driving safety, can timely drain the internal water of the road, avoids the water retention in the road for a long time, reduces the softening of the upper and lower base layers caused by the water retention for a long time, and further causes the pumping phenomenon, achieves the purpose of curing the road pumping disease, keeps the road in a good state, and prolongs the service life of the road. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the utility model.

[0020] Figure 2 It is a longitudinal sectional schematic view of the utility model.

[0021] Figure 3 It is a transverse sectional schematic view of the utility model.

[0022] Figure 4 It is a permeable pipe structure schematic view of the utility model.

[0023] Main component symbol explanation: 1, rainwater inspection well; 2, surface layer; 3, upper base layer; 4, lower base layer; 5, cushion layer; 6, water collecting pipe; 7, blind ditch; 8, permeable pipe; 9, gravel filling layer; 10, inverse filtration geotextile; 11, permeable hole; 12, present surface layer; 13, repaired surface layer; 14, fine-grained asphalt concrete SMA-13 upper surface layer; 15, medium-grained modified asphalt concrete AC-16C middle surface layer; 16, coarse-grained asphalt concrete AC-25C lower surface layer; 17, present upper base layer; 18, repaired upper base layer; 19, polypropylene anti-cracking geotextile and permeable asphalt; 20, transverse blind ditch; 21, longitudinal blind ditch; L1, transverse blind ditch arrangement interval; L2, interval between longitudinal blind ditch and road curb strip. DETAILED DESCRIPTION

[0024] The utility model will be further explained in combination with the drawings and specific embodiments.

[0025] As Figures 1-4The utility model discloses an asphalt road drainage system, including rainwater inspection well 1 and the surface layer 2, upper base layer 3, lower base layer 4 and cushion layer 5 that are sequentially arranged from top to bottom, still include water collecting pipe 6 and multiple blind ditch 7. Rainwater inspection well 1 is located at auxiliary road, and its topography is relatively lower. The thickness of surface layer 2 is 18cm, including present situation surface layer 12 and repair surface layer 13, wherein, present situation surface layer 12 is asphalt concrete layer, and repair surface layer 13 includes 4cm thick fine grain formula asphalt concrete SMA-13 upper surface layer 14, 6cm thick medium grain formula modified asphalt concrete AC-16C middle surface layer 15 and 8cm thick coarse grain formula asphalt concrete AC-25C lower surface layer 16 that are sequentially arranged from top to bottom. The thickness of upper base layer 3 is 30cm, including present situation upper base layer 17 and repair upper base layer 18, wherein, present situation upper base layer 17 is 5% cement stabilized gravel layer, and repair upper base layer 18 is C25 concrete layer, to improve the durability of pavement structure, and prevent water infiltration. Lower base layer 4 is 3% cement stabilized gravel layer, and cushion layer 5 is graded gravel layer.

[0026] The area where the above-mentioned repair surface layer 13 and repair upper base layer 18 are located corresponds to the heaving disease area, and both are located directly above the blind ditch 7 and are provided with polypropylene anti-cracking geotextile and penetration asphalt 19 between them. The polypropylene anti-cracking geotextile can enhance the load-bearing capacity and stability of the pavement and has good anti-cracking and anti-seepage effects, and the penetration asphalt can enhance the adhesion between the repair surface layer 13 and the repair upper base layer 18 and form a waterproof layer, and both can have a certain protective effect.

[0027] As for drainage, any blind ditch 7 includes a groove, a permeable pipe 8, a gravel filling layer 9 and two layers of anti-filtration geotextile 10. The permeable pipe 8 is laid in the groove, and a plurality of water-permeable holes 11 are provided through the pipe wall of the permeable pipe 8, the position of the water-permeable holes 11 avoids the bottom of the permeable pipe 8, water can be introduced into the permeable pipe 8, and the water guide of the permeable pipe 8 is not affected. One of the two layers of anti-filtration geotextile 10 is laid on each wall surface of the groove to wrap the gravel filling layer 9, and the other is wrapped outside the permeable pipe 8 to prevent blockage, both layers of anti-filtration geotextile 10 do not affect drainage and can also have an isolation effect to keep the road structure stable. The gravel filling layer 9 is filled in the groove and between the two layers of anti-filtration geotextile 10, which enhances the structural stability, and uses the characteristics of large void and high water permeability to realize rapid water guide and guide water into the permeable pipe 8. Each blind ditch 7 is arranged along the transverse and longitudinal directions of the road, and the permeable pipes 8 in each blind ditch 7 are connected to each other. The above-mentioned water collecting pipe 6 is connected to the permeable pipes 8 and the rainwater inspection well 1, and guides the accumulated water in each permeable pipe 8 to the rainwater inspection well 1 to realize the drainage of accumulated water.

[0028] In this embodiment, the blind ditch 7 includes transverse blind ditches 20 and longitudinal blind ditches 21, wherein the transverse blind ditches 20 are arranged along the transverse direction of the road, i.e. along the direction perpendicular to the driving direction of the road, the cross-sectional width is 30 cm, and the cross-sectional height is 40 cm; the longitudinal blind ditches 21 are arranged along the longitudinal direction of the road, i.e. along the driving direction of the road, and the cross-sectional width and the cross-sectional height are both set to 40 cm.

[0029] The transverse blind ditches 20 are arranged in multiple rows, which can fully absorb and introduce the internal water of the road. The arrangement interval L1 of the transverse blind ditches 20 is 4-5 m, and is preferably 5 m. The longitudinal blind ditches 21 are located on the side of the transverse blind ditches 20 close to the road curb, and are connected with each of the transverse blind ditches 20, so as to concentrate the water flowing into each of the transverse blind ditches 20 together, so as to be uniformly discharged from the system. The interval L2 between the longitudinal blind ditches 21 and the road curb is 40-50 cm, and is preferably 50 cm. The water collecting pipe 6 is connected between the longitudinal blind ditches 21 and the rainwater inspection well 1 to guide water.

[0030] More specifically, the water permeable pipe 8 and the water collecting pipe 6 both adopt a PVC pipe with a diameter of 10 cm. The gravel filling layer 9 is filled with gravel with a particle size of 5-8 cm, and the pore size of the water permeable hole 11 is smaller than the particle size of the gravel. The diameter of the water permeable hole 11 is 0.8-1.2 cm, and is preferably set to 1 cm. The water permeable hole 11 is mainly arranged on the top and both sides of the water permeable pipe 8, and the opening rate is 2.5-3.5%. The water permeable hole 11 is arranged in a plum blossom shape, which can guide water while ensuring the structural strength of the water permeable pipe 8. In this embodiment, the transverse interval between the water permeable holes 11 is 2.8-3.2 cm, and is preferably 3 cm; and the longitudinal interval between the water permeable holes 11 is 2.8-3.2 cm, and is preferably 3 cm.

[0031] The steps of setting the system are as follows:

[0032] S1, detect and investigate the road surface pumping disease, and determine the road surface disease range.

[0033] S2, analyze the causes of pumping disease, and select the corresponding road disease treatment process. In the road disease range, the road surface layer 2 and the upper base layer 3 are first milled, and then the lower base layer 4 is excavated to bury the blind ditch 7. When burying the blind ditch 7, a reverse filter geotextile 10 is first laid in the trench, and then a water permeable pipe 8 wrapped with another reverse filter geotextile 10 is laid, and then gravel is filled. When laying the water permeable pipe 8, the slope of the water permeable pipe 8 is ≮1.0%, which can quickly discharge the internal water of the road, so as to prevent the water from staying in the pipe.

[0034] S3, after the blind ditch 7 is buried, the road surface upper base layer 3 and the road surface asphalt concrete surface layer 2 are restored by using cement concrete, to form the repaired upper base layer 18 and the repaired surface layer 13.

[0035] From the above, the system has excellent protection ability and drainage capacity, which starts from the root of the road surface pumping disease, whether in the area with large precipitation or in the road section with high underground water level, can play a good drainage effect, can effectively avoid the road surface pumping disease, keep the road in good condition, prolong the service life of the road surface, has the advantages of convenient construction, completely treating the disease and short maintenance time.

[0036] Although the utility model is specifically shown and introduced in combination with the preferred embodiments, those skilled in the art should understand that various changes can be made to the utility model in form and details without departing from the spirit and scope of the utility model defined in the appended claims, and all are within the protection scope of the utility model.

Claims

1. An asphalt road drainage system comprising a stormwater inspection chamber and a surface layer, an upper base layer, a lower base layer and a cushion layer arranged in that order from top to bottom, characterized in that: The water collecting pipe and a plurality of blind gutters are also included, the blind gutters include a trench, a water permeable pipe, a gravel filling layer and two layers of anti-filtration geotextile, the water permeable pipe is laid in the trench, a plurality of water permeable holes are provided through the pipe wall of the water permeable pipe, the water permeable holes are located away from the bottom of the water permeable pipe, one layer of the anti-filtration geotextile is laid on each wall surface of the trench, and the other layer of the anti-filtration geotextile is wrapped outside the water permeable pipe, and the gravel filling layer is filled in the trench and located between the two layers of anti-filtration geotextile; the blind gutters are arranged along the transverse and longitudinal directions of the road, the water permeable pipes in each blind gutter are connected to each other, and the water collecting pipe is connected to the water permeable pipes and the rainwater inspection well.

2. The asphalt road drainage system of claim 1, wherein: The surface layer includes an existing surface layer and a repaired surface layer, the repaired surface layer includes a fine-grained asphalt concrete SMA-13 upper surface layer, a medium-grained modified asphalt concrete AC-16C middle surface layer and a coarse-grained asphalt concrete AC-25C lower surface layer arranged in sequence from top to bottom; the upper base layer includes an existing upper base layer and a repaired upper base layer, the repaired upper base layer is a C25 concrete layer; the repaired surface layer and the repaired upper base layer are located directly above the blind gutters and are provided with a polypropylene anti-cracking geotextile and a penetrating layer asphalt between them.

3. The asphalt road drainage system of claim 1, wherein: The blind gutters include transverse blind gutters arranged along the transverse direction of the road and longitudinal blind gutters arranged along the longitudinal direction of the road; the transverse blind gutters are arranged at intervals, and the arrangement interval is 4-5 m; the longitudinal blind gutters are located on the side of the transverse blind gutters close to the road curb and are connected to each transverse blind gutter; the interval between the longitudinal blind gutters and the road curb is 40-50 cm, and the water collecting pipe is connected between the longitudinal blind gutters and the rainwater inspection well.

4. The asphalt roadway drainage system of claim 1, wherein: The gravel filling layer is formed by gravel with a particle size of 5-8 cm, and the pore size of the water permeable hole is smaller than the particle size of the gravel.

5. The asphalt roadway drainage system of claim 1, wherein: The water permeable pipe is a PVC pipe, and the laying slope of the water permeable pipe is ≮1.0%.

6. The asphalt road drainage system of claim 1, wherein: The water permeable holes are provided on the top and side of the water permeable pipe, and the opening rate is 2.5-3.5%.

7. The asphalt road drainage system of claim 1, wherein: The water permeable holes are arranged in a quincunx shape, the transverse spacing between each water permeable hole is 2.8-3.2 cm, the longitudinal spacing is 2.8-3.2 cm, and the diameter of the water permeable hole is 0.8-1.2 cm.

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